servo motor resets 16f877a

[Acetronics2]

Hi Acetronics,
I think you are wrong because my signal is 50hz.
?

Lol ...

It has been verifyed with a R/C Pulsemeter.

Checks pulse AND repeating frequency ...

Y've done the mods to have your program running ...

Runs awfully bad for a tracker, but runs ... on the USB supply from my PC. ( 500 mA ! )

YOU are wrong in your calculations ... that's it !!!

[burak450]

Hi Acetronics,
First of all,calm down

I just said my idea...

I havent got R/C Pulsemeter,I cant measure the pulses...

Probably your calculations are right.I am here because my project doesnt work correctly and want to have second opinion.

Can you give me the right code ?

will only changing variable type byte to word be enough????

[skimask]

Can you give me the right code ?

will only changing variable type byte to word be enough????

Probably not...
Think about this...
How long does it take for ADCIN to execute?
How long does it take for LCDOUT to execute?
And fix your power supply...

[burak450]

And fix your power supply...

as you said that you mean same ground but another power supply...

did I understand right?

[skimask]

as you said that you mean same ground but another power supply...

did I understand right?

No I mean read back thru the thread! I don't see any mention of adding any capacitors anywhere in the circuit...except where somebody but you has mentioned them...
And, you say you are using a switching adapter, like a wall-wart rated at [email protected]?
How long is the cord feeding the PIC/servos? How much 'noise' is getting to your PIC? How much 'noise' does your servo generate under a load? Any capacitors in there anywhere?
http://en.wikipedia.org/wiki/Decoupling_capacitor

[Acetronics2]

Hi, Burak

Don't worry for me ... I always am calm.

I Exceptionnaly cook code for others ...


so,

- you'll fist check "T" calculations and do not allow it to go out of the 800 - 2200 µs range

- Check for a "decent" increment to the same "T" variable

- Understand that 50 Hz is not a MUST ... just be in the 35-50 Hz range; doesn't need to be a constant frequ. nor.


PS: "Give me THE code" or "Give me THE scheme" are the sentences that suddently re activate my Altzheimer ...

What Were we talking about ??? ...

Alain

[burak450]

Ok.I wont want you to give code because i know Altzheimer is very tough disease

I am gonna try what you said.If I fail I will disturb you again

Thanks for help up to now....

[Macgman2000]

Why not just write simple code to sweep servo left to right and back right to left for testing? BTW, if you use a 5v regulator with 5v output power supply, it will cause a power drop when you try to draw current. A voltage reg will probably need 6.5v++ input voltage. Also, I have driven 4 large servos off of 2 paralleled voltage regs and a low current reg for the pic....no problems at all.

[Acetronics2]

Hi, Burak

We haven't solved the power problem ...

so, I ask the question once more : Which is your testboard ???

Alain

[burak450]

Macgman2000 wants my code...

I wrote a new code to protect values which makes out of range.

DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 5
DEFINE LCD_BITS  4
DEFINE LCD_LINES 2
DEFINE OSC 4                                                                       
DEFINE ADC_BITS     8      
DEFINE ADC_CLOCK  3       
DEFINE ADC_SAMPLEUS 100
SYMBOL F=PORTA.0
SYMBOL G=PORTA.1
alta var byte
usta var byte
altb var byte
ustb var byte
ADCON1=2
TRISA=3
TRISB=0
PORTB=0
TRISC=0
LCDOUT $FE,1 
pause 4000
adcin  0,ALTa
ADCin  1,usta

t var byte
i var byte
T=150

yap:




adcin  0,altb
ADCin  1,ustb






if  ((((usta+10)*100)/(ustb+10)))>130 and (not (t>194)) then 
T=T+15
endif

if (((alta*100)/altb))>130 AND (not (t<51)) then 
T=T-15
endif


gosub motor





  

LCDOUT $fe,2,#usta," ",#ustb," ",#altA," ",#altb
lcdOUT $fe,$C0,#T   

goto yap

motor:
for i=0 to 25
PULSOUT PORTC.2,T
PAUSEUS 20000-(T*10)
next
return

end

I am using breadboards.A minute ago i tried to connect two parallel power supply.Servo didnt reset MCU.I was glad but sometimes when i turned power on ,servo turned full left sometimes didnt.I think my servos are crazy .BTW I connected a capacitor.

I have an idea.Can this error(full left error) occur because of my code that i wrote.too many PAUSEUS may make this error.Should I try DUTYCYLE or PWM codes???

Or Is there any power problem???

[burak450]

A voltage reg will probably need 6.5v++ input voltage. Also, I have driven 4 large servos off of 2 paralleled voltage regs and a low current reg for the pic....no problems at all.

A low current reg?

He said we used large servos and mine is not large but I have to ask it because after a hour i will go to buy (9v supply,7805..,)

Should I buy a current regulator?

[mackrackit]

No current regulator.
What he means is say one 7805 will run the PIC (7805 at best 1 amp) = low current.

Power supply for motors are made from parallel 7805s or some other type to handle the amperage needed.